A powder dispensing apparatus for dispensing a powder either with or without a liquid is presented. The locking member includes a key portion for unlocking the tightening mechanism when the cable is removed from the item. When the master electronic element identifies that an electronic element is not functioning properly, the network executes a predefined response, such as a counter measure that limits the functional capability of the improperly functioning electronic element or other electronic elements. The aperture and the optical system are adjusted so that the priority subject is focused and the subject other than the priority subject is within a depth of field of the photographing unit.